xylem

xy·lem

X0010000 (zī′ləm)n. The tissue of vascular plants that conducts water and minerals, provides support, and consists of tracheary elements and parenchyma cells. Woody tissue is made of secondary xylem produced by the vascular cambium.

[German, from Greek xulon, wood.]

xylem

(ˈzaɪləm; -lɛm) n (Botany) a plant tissue that conducts water and mineral salts from the roots to all other parts, provides mechanical support, and forms the wood of trees and shrubs. It is of two types (protoxylem and metaxylem), both of which are made up mainly of vessels and tracheids. See also protoxylem, metaxylem[C19: from Greek xulon wood]

xy•lem

(ˈzaɪ ləm, -lɛm)

n. a compound tissue in vascular plants that helps provide support and that conducts water and nutrients upward from the roots, consisting of tracheids, vessels, parenchyma cells, and woody fibers. [1870–75; < German < Greek xýl(on) wood (see phloem)]

xylemXylem cells in the stem carry water from a plant's roots to its leaves. The phloem distributes food that is made in the plant's leaves to other parts of the plant. The cambium cells divide into either xylem or phloem cells. The cortex and pith, seen in the stem cross section, provide structural support.

xy·lem

(zī′ləm) A tissue in vascular plants that carries water and dissolved minerals up from the roots through the stem to the leaves and provides support for the softer tissues. Xylem consists of various elongated cells that function as tubes. In a tree trunk, the innermost part of the wood is dead but structurally strong xylem, while the outer part consists of living xylem, and beyond it, layers of cambium and phloem. See more at cambium, photosynthesis. Compare phloem.

xylem

Tissue in plants that carries water and mineral salts from the roots to the rest of the plant.

Thesaurus

Noun

xylem - the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vesselsvascular tissue - tissue that conducts water and nutrients through the plant body in higher plantstracheid - long tubular cell peculiar to xylemligneous plant, woody plant - a plant having hard lignified tissues or woody parts especially stems

Translations

ксилема

xylem

(zī`ləm): see stemstem,
supporting structure of a plant, serving also to conduct and to store food materials. The stems of herbaceous and of woody plants differ: those of herbaceous plants are usually green and pliant and are covered by a thin epidermis instead of by the bark of woody plants.
..... Click the link for more information. ; woodwood,
botanically, the xylem tissue that forms the bulk of the stem of a woody plant. Xylem conducts sap upward from the roots to the leaves, stores food in the form of complex carbohydrates, and provides support; it is made up of various types of cells specialized for each of
..... Click the link for more information. .

Xylem

The principal water-conducting tissue and the chief supporting system of higher plants. This tissue and the associated phloem constitute the vascular system of vascular plants. Xylem is composed of various kinds of cells, living or nonliving. The structure of these cells differs in their functions, but characteristically all have a rigid and enduring cell wall that is well preserved in fossils.

In terms of their functions, the kinds of cells in xylem are those related principally to conduction and support, tracheids; to conduction, vessel members; to support, fibers; and to food storage, parenchyma. Vessel members and tracheids are often called tracheary elements. The cells in each of the four categories vary widely in structure. See Parenchyma

Xylem tissues arise in later stages of embryo development of a given plant and are added to by differentiation of cells derived from the apical meristems of roots and stems. Growth and differentiation of tissues derived from the apical meristem provide the primary body of the plant, and the xylem tissues formed in it are called primary. Secondary xylem, when present, is produced by the vascular cambium. See Lateral meristem

In the trade, softwood is a name for xylem of gymnosperms (conifers) and hardwood for xylem of angiosperms. The terms do not refer to actual hardness of the wood. Woods of gymnosperms are generally composed only of tracheids, wood parenchyma, and small rays, but differ in detail. Resin ducts are present in many softwoods. Woods of angiosperms show extreme variation in both vertical and horizontal systems, but with few exceptions have vessels.

Xylem

a tissue of terrestrial plants that serves to conduct water and mineral salts upward from the roots through the plant. Xylem is distributed as a solid ring or in conducting, or fibrovas-cular, bundles. It consists of conducting cells proper (tracheae [vessels] and tracheids), mechanical cells (libriform), and xylem and ray parenchyma. The walls of all xylem cells lignify. True xylem is characteristic of all pteropsids, gymnosperms, and flowering plants. The xylem of perennial stems and roots is predominantly called wood. Primary xylem arises from the procambium. The first element of the primary xylem to appear is the proto-xylem, which consists of tracheids and vessels with ringed and spiral thickenings of the walls. The metaxylem, which has scalariform and pitted thickenings, forms somewhat later. Secondary xylem is formed by the cambium.

O. N. CHISTIAKOVA

xylem

[′zī·ləm] (botany) The principal water-conducting tissue and the chief supporting tissue of higher plants; composed of tracheids, vessel members, fibers, and parenchyma.

xylem

a plant tissue that conducts water and mineral salts from the roots to all other parts, provides mechanical support, and forms the wood of trees and shrubs. It is of two types (see protoxylem, metaxylem), both of which are made up mainly of vessels and tracheids

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Words related to xylem

noun the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels

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